The "god" that "had gone away" in this case is the group of humans that inhabited the house as they were the gods of that particular place. But the idea is that humanity in general had been destroyed, those who considered themselves the rulers of the universe and had been willing to create such destructive devices. The idea of man being superior to nature, of being god-like is an important theme in Bradbury's work, particularly in this short story.

Bradbury aims to point out that humans are not god-like and that nature will triumph eventually, particularly if humans continue to believe that they can tamper with the forces of nature and just ignore the possible consequences, such as in the creation of and use of nuclear weapons.

The worship of technology and man's ability to create and manipulate it is also part of this "religion" and one that continues briefly by the working of the machines in the house until it is destroyed by a force of nature, in this case fire.